Freshwater fishes are those that live in rivers, lakes and other bodies of water that are not salty. The best known species are the barbel, the eel or the carp.
Unlike saltwater fish, freshwater fish never drink water. It’s due to the fact that they have a higher concentration of salts in their interior than those in their environment, which is why it penetrates directly by osmosis through the epithelium of the body and the gills.
This mechanism by which the concentration of salts between the interior of fish and their aquatic environment tends to balance is a natural physical process it’s called osmosisregulation, and it is essential for the life of these organisms.
«Peces de agua dulce» es un módulo de la Sala del Agua incluido dentro de la sección «Agua y vida»